Sash lock



FIG. 1 is a perspective view of a sash lock showing my new design;

FIG. 2 is a first side view thereof;

FIG. 3 is a second side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a first end view thereof; and,

FIG. 6 is a second end view thereof.

The broken lines showing are for illustrative purposes and form no part of the claimed design. 

The ornamental design for a sash lock, as shown and described. 